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<b>Username:</b> 
<span class="in_place_editor_field" 
      id="user_username_73_in_place_editor">guido von rossum</span>
<script type="text/javascript">
//<![CDATA[
new Ajax.InPlaceEditor('user_username_73_in_place_editor', 
                       '/user/set_user_username/73')
//]]>
</script>